population pyramid franklin county comprises ottawa, ks micropolitan statistical area, included in kansas city-overland park-kansas city, mo-ks combined statistical area. as of u.s. census in 2000, there 24,784 people, 9,452 households, , 6,720 families residing in county. population density 43 people per square mile (17/km²). there 10,229 housing units @ average density of 18 per square mile (7/km²). racial makeup of county 95.05% white, 1.21% black or african american, 0.94% native american, 0.31% asian, 0.78% other races, , 1.71% 2 or more races. hispanic or latino of race 2.62% of population. there 9,452 households out of 34.70% had children under age of 18 living them, 58.10% married couples living together, 8.90% had female householder no husband present, , 28.90% non-families. 24.80% of households made of individuals , 11.30% had living alone 65 years of age or older. average household size 2.56 , average family size 3.04. in county, population spread out 27.50% under age of 18,